package cn.com.chengq.extension;

import java.awt.*;

public class AreaApp {
    /**
     * 这里是一个已安装扩展的例子
     */
    public static void main(String[] args) {
        int width = 10;
        int height = 5;

        Rectangle r = new Rectangle(width, height);
        System.out.println("The rectangle's area is " + RectangleArea.area(r));
    }

}
